var normalm = L.tileLayer.chinaProvider('TianDiTu.Normal.Map', {
        // maxZoom: 18,
        // minZoom: 5
    }),
    normala = L.tileLayer.chinaProvider('TianDiTu.Normal.Annotion', {
        // maxZoom: 18,
        // minZoom: 5
    }),
    imgm = L.tileLayer.chinaProvider('TianDiTu.Satellite.Map', {
        // maxZoom: 18,
        // minZoom: 5
    }),
    imga = L.tileLayer.chinaProvider('TianDiTu.Satellite.Annotion', {
        // maxZoom: 18,
        // minZoom: 5
    });

var normal = L.layerGroup([normalm, normala]),
    image = L.layerGroup([imgm, imga]);

var baseLayers = {
    "地图": normal,
    "影像": image,
};
var overlayLayers = {};
